The 831E is connected to the commercial operator in the same manner as a 3-button station and provides open, close and stop functions via radio control. The receiver is powered from the operator’s 24 VAC transformer. The antenna is removable and may be moved (using coaxial cable) to a new location for better RF reception. When receivers have to be installed in close proximity to each other (such as Fire Stations), master/slave units may be used to reduce the potential for receiver cross-talk. •